You are working as a consultant for a private hospital. Your client is hoping to benefit from your analytical skills in managing the customer waiting time at the reception of the X Ray department. Based on consultancy work that was done a couple of years ago in this department, control charts are used to study the variations in the waiting times. The control charts also include lower specification limit for the waiting time. The client seems to have the impression that as long as the samples of waiting times are within the specification limit there shouldn’t be any concerns about the operations. Write a short brief with some examples to politely prove him wrong.